Plant nuclei move to escape ultraviolet-induced DNA damage and cell death

Kosei Iwabuchi, Jun Hidema, Kentaro Tamura, Shingo Takagi, Ikuko Hara-Nishimura

    Research output: Contribution to journalArticlepeer-review

    13 Citations (Scopus)

    Abstract

    A striking feature of plant nuclei is their light-dependent movement. In Arabidopsis (Arabidopsis thaliana) leaf mesophyll cells, the nuclei move to the side walls of cells within 1 to 3 h after blue-light reception, although the reason is unknown. Here, we show that the nuclear movement is a rapid and effective strategy to avoid ultraviolet B (UVB)-induced damages. Mesophyll nuclei were positioned on the cell bottom in the dark, but sudden exposure of these cells to UVB caused severe DNA damage and cell death. The damage was remarkably reduced in both blue-light-treated leaves and mutant leaves defective in the actin cytoskeleton. Intriguingly, in plants grown under high-light conditions, the mesophyll nuclei remained on the side walls even in the dark. These results suggest that plants have two strategies for reducing UVB exposure: rapid nuclear movement against acute exposure and nuclear anchoring against chronic exposure.

    Original languageEnglish
    Pages (from-to)678-685
    Number of pages8
    JournalPlant physiology
    Volume170
    Issue number2
    DOIs
    Publication statusPublished - 2016 Feb

    ASJC Scopus subject areas

    • Physiology
    • Genetics
    • Plant Science

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